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Description
See http://bugs.mysql.com/bug.php?id=73886
and older http://bugs.mysql.com/bug.php?id=16832
"ALGORITHM missing from "information_schema.views"
The 5.0 solution back then was not to add an ALGORITHM column as requested, but to add the ALGORITHM as comment to the I_S.VIEWS.VIEW_DEFINITION column as e.g.
/* ALGORITHM=MERGE */ select `test`.`t1`.`id` AS `id` from `test`.`t1`
I can verify that these comments are shown by MySQL 5.0.45, but not e.g. MySQL 5.1.67 or MySQL 5.6.20 ...
... and I also think that a new ALGORITHM column would have been the better solution as with the comment approach parsing of the VIEW_DEFINITION result would be necessary to extract the ALGORITHM instead of just saying
SELECT ALGORITHM FROM I_S.VIEWS WHERE ...
How to repeat:
mysql> drop table t1;
Query OK, 0 rows affected (0.00 sec)
mysql> create table t1(id int primary key);
Query OK, 0 rows affected (0.05 sec)
mysql> create algorithm=merge view v1 as select * from t1;
ERROR 1050 (42S01): Table 'v1' already exists
mysql> drop view v1;
Query OK, 0 rows affected (0.00 sec)
mysql> drop view v2;
ERROR 1051 (42S02): Unknown table 'v2'
mysql> create algorithm=merge view v1 as select * from t1;
Query OK, 0 rows affected (0.04 sec)
mysql> create algorithm=temptable view v2 as select * from t1;
Query OK, 0 rows affected (0.04 sec)
mysql> select * from information_schema.views
-> ;
+---------------+--------------+------------+--------------------------------------------------+--------------+--------------+----------------+---------------+----------------------+----------------------+
| TABLE_CATALOG | TABLE_SCHEMA | TABLE_NAME | VIEW_DEFINITION | CHECK_OPTION | IS_UPDATABLE | DEFINER | SECURITY_TYPE | CHARACTER_SET_CLIENT | COLLATION_CONNECTION |
+---------------+--------------+------------+--------------------------------------------------+--------------+--------------+----------------+---------------+----------------------+----------------------+
| NULL | test | v1 | select `test`.`t1`.`id` AS `id` from `test`.`t1` | NONE | YES | root@localhost | DEFINER | utf8 | utf8_general_ci |
| NULL | test | v2 | select `test`.`t1`.`id` AS `id` from `test`.`t1` | NONE | NO | root@localhost | DEFINER | utf8 | utf8_general_ci |
+---------------+--------------+------------+--------------------------------------------------+--------------+--------------+----------------+---------------+----------------------+----------------------+
2 rows in set (0.01 sec)
Both views only differ by their name in the INFORMATION_SCHEMA.VIEWS table, the difference in the ALGORITHM used is invisible when relying on INFORMATION_SCHEMA unless using a 5.0.x version ... (with x>=25)
Suggested fix:
Add an ALGORITHM column to the VIEWS table as originally requested
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MDEV-7406 I can't get from INFORMATION_SCHEMA original SQL code creating VIEW
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